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[单选题]

【C12】

A.only if

B.if only

C.when only

D.when if

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更多“【C12】A．only ifB．if onlyC．when …”相关的问题

第1题

Ill go if youre going,______,Id rather stay at home.A．only ifB．if onlyC．even ifD．if not

Ill go if youre going,______,Id rather stay at home.

A．only if

B．if only

C．even if

D．if not

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第2题

A．Only two years after his retirement.B．Only three years after his retirement.C．Only o

A．Only two years after his retirement.

B．Only three years after his retirement.

C．Only one year after his retirement.

D．Only four years after his retirement.

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第3题

Nowadays almost every city has an airport,【C1】______two, in the case of some big cities. L

ike a railway station, an airport is a very【C2】______place. At almost any hour of the day or night it is thronged【C3】______people, many of them are passengers who are【C4】______waiting for a flight out or who have just【C5】______Today, a great number of people travel from one country to another by plane just as【C6】______as other people【C7】______from one town to another within the same country by train or bus.

The big building in which passengers wait for their plane is called the【C8】______When a passenger arrives 34 the terminal, he goes to the airline【C10】______has arranged his trip. There he【C11】______his ticket as【C12】______that he has a seat in the plane. He also【C13】______his heavy luggage to【C14】______and sent to the hold of the aircraft. The passenger is allowed to carry only light articles with him. If his ticket is in order, and his luggage is not【C15】______, he is given a card called a【C16】______pass which allows his admission【C17】______the plane. However, he can not proceed to the aircraft【C18】______he【C19】______an announcement over the loudspeakers that his plane is about to【C20】______

【C1】

A．only

B．even

C．lastly

D．ever

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第4题

表面活性剂C1_{2<／sub>H_{2<／sub>3O（C_{2<／sub>H_{4<／sub>O)_{2<／sub>0H属于（）。}}}}}

A.离子型

B.阳离子型

C.阴离子型

D.两面表面活性剂

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第5题

【39】

A.even if

B.if only

C.only if

D.though

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第6题

Text Nowadays almost every city has an airport,【C1】______two, in the ease of some big citi

Text

Nowadays almost every city has an airport,【C1】______two, in the ease of some big cities. Like a railway station, an airport is a very【C2】______place. At almost any hour of the day or night it is thronged【C3】______people, many of them are passengers who are【C4】______waiting for a flight out or who have just【C5】______. Today, a great number of people travel from one country to another by plane just as【C6】______as other people【C7】______from one town to another within the same country by train or bus.

The big building in which passengers wait for their plane is called the【C8】______. When a passenger arrives【C9】______the terminal, he goes to the airline【C10】______has arranged his trip. There he【C11】______his ticket as【C12】______that he has a seat in the plane. He also【C13】______his heavy luggage to【C14】______and sent to the hold of the aircraft. The passenger is allowed to carry only light articles with him. If his ticket is in order, and his luggage is not【C15】______, he is given a card called a【C16】______pass which allows his admission【C17】______the plane. However, he can not proceed to the aircraft【C18】______he【C19】______an announcement over the loudspeakers that his plane is about to【C20】______.

…

【C1】

A．only

B．even

C．lastly

D．ever

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第7题

A．even ifB．if onlyC．only ifD．as if

A．even if

B．if only

C．only if

D．as if

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第8题

I don't know______he will come tomorrow.______he comes, I'll tell you.A．if; IfB．if; Whethe

I don't know______he will come tomorrow.______he comes, I'll tell you.

A．if; If

B．if; Whether

C．whether; Whether

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第9题

I don't know ______ he will come tomorrow.______ he comes, I'll tell you.A．if; IfB．if; Whe

I don't know ______ he will come tomorrow. ______ he comes, I'll tell you.

A．if; If

B．if; Whether

C．whether; Whether

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第10题

The four blood types are【C1】______as A, B, AB, and O. Blood type A【C2】______red blood cell

s that have a substance A on their surface. This type of blood also contains an antibody directed【C3】______substance B, found on the red cells of persons with blood type【C4】______. Type B blood contains the【C5】______combination. Blood type AB contains【C6】______antibody, but red cells in this type of blood contain both A and B substances. In type O blood, neither substance is【C7】______on the red cells, but the individual is【C8】______of forming antibodies directed against red cells containing substance A or B. If blood type A is transfused【C9】______a person with B type blood, anti-A antibodies in the recipient will【C10】______the transfused A red cells. Because O type blood has【C11】______substance on its red cells, it can be given successfully【C12】______almost any person. Persons with blood type AB have no antibodies and can receive【C13】______of the four types of blood; thus blood types O and AB are called universal donors and universal recipients,【C14】______.

【C15】______hereditary blood-group systems have【C16】______been discovered. The hereditary blood constituent called Rh factor is of great【C17】______in blood transfusions because it creates reactions that can threaten the life of newborn【C18】______. More than twenty【C19】______blood types have been discovered. Their primary importance is in【C20】______cases involving proof of father-and-child relationship.

【C1】

A．called

B．named

C．known

D．recognized

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