A．inB．onC．underD．between
A. in
B. on
C. under
D. between
A．fastB．fasterC．fastestD．fastly
A. fast
B. faster
C. fastest
D. fastly
A．thatB．whenC．whoD．which
A. that
B. when
C. who
D. which
What may be the importance of the research？
A. It shows sleep may help us manage information.
B. It helps find out the common themes of words.
C. It tells us that more sleep can improve health.
D. It proves the value of the old-fashioned advice.
微信支付 
支付宝支付