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【单选题】
已知向量 a =（2，1），向量 b =（x，3），且 a ∥ b ，则x的值是 [ ]A.
12
B.
9
C.
6
D.
-6
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举一反三
【简答题】From the text we can infer that [ A] the commitment to improve the capacities of the poor will hardly be made. [ B] the investment in educational ,medical and job programs is non-profitable. [ C] the ...
【简答题】We have one caveat on this PO.
【单选题】询问客人是否需要添加食品时应说( ) 。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
、还要饭吗
B.
、要哪种饮料 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
C.
、要汤吗
D.
、给您再添点饭吗 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
【单选题】We learn from the text that Edward Bannerman is probably
A.
an enthusiast in agricultural policy.
B.
a tough leader in social affairs.
C.
an doubter of spending on research.
D.
a pioneer in space exploration.
【单选题】听力原文：Originally, we were supposed to have a science test this afternoon, but it was postponed because the teacher had to attend a conference. (30)
A.
The teacher postponed the conference.
B.
The students will be attending the conference.
C.
There won't be a test this afternoon.
D.
The students took a science test that afternoon.
【单选题】We can conclude from the first two paragraphs that whether a male practices monogamy of polygamy depends on ______.
A.
the amount of nurturing the young
B.
the sex of offspring
C.
the attractiveness of his female partner
D.
the time of conception
【简答题】From the text we learn that the laser can_________ [A] cut a structure from a right position [ B ] design parts of a complex structure [ C] measure the distance between planets [ D] predict the moveme...
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