题目内容

Muscular relaxation, a temperature drop, and breath regularity are characteristics of

A. REM sleep
B. Stage 1 sleep
C. delta rhythms
D. Stage 2 and 3 sleep

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A．relatedB．popularC．loyalD．concerned

A. related
B. popular
C. loyal
D. concerned

A．toB．atC．fromD．on

A. to
B. at
C. from
D. on

Compared with vegetable protein, animal protein contains

A. more proteins
B. more nutrients
C. more minerals
D. more amino-acids

Those all-you-can-eat animals often have _________.