【判断题】在强直收缩中,骨骼肌的动作电位会发生叠加或总和。
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Smilingandlaughinghas actuallybeenshowntorelieve __________ andstress.
A. suburb
B. tension
C. substance
D. talent
Smoking was recognized by many people as a slightly dirty and __________ habit.
A. unpleasant
B. unpleased
C. pleasant
D. pleased
So many hotels __________ each other.
A. substract
B. resemble
C. vanish
D. import
Take out accident __________ before you go on your trip.
A. insurance
B. ingredient
C. fate
D. legislation