Generally, the host tells the guest where______.
A. the toilet is
B. the kitchen is
C. the bedroom is
D. the study is
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The influenza outbreak in this story began in______.
A. Singapore
B. China
C. Hong Kong
D. India
The sputniks hanging from the ceiling are intended______.
A. to help maintain (维持) good order in the store
B. to make films that can be used as evidence
C. to be used as evidence against customers
D. to frighten shoplifters by their appearance
A postage stamp's value to collectors is raised if______.
A. there are few others like it
B. there are no errors on the stamp
C. a mistake is made in the printing
D. both A and C
一梁的截面为正方形，若按图示两种方式放置，则两者的刚度关系为()。
A. (a)＜(b)
B. (a)=(b)
C. (a)＞(b)
D. 不能确定
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