The distance a swing moves from its resting position is called its ______.
A. revolution
B. movement
C. frequency
D. amplitude
查看答案
To make human cells more mouselike scientists tried ______.
A. to subject them to two more genes
B. to keep the division from slowing down
C. to promote the production of telomerase
D. to prevent excessive ceils copying
According to the passage, one is thought vicious when he ______.
A. gathers up money at the sacrifice of all his family members
B. practices endless thrifty to guard his people from poverty
C. stores continuously for his own and his relatives' needs
D. saves too much but wouldn't spend it for the necessary
What should you do if you want to make a cheaper daytime call？
A. ask the operator
B. change to DST
C. phone on Sunday
A．forB．ofC．up
A. for
B. of
C. up
微信支付 
支付宝支付