题目内容
Laughter clubs ________.
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Complete these sentences with the words or phrases in the box.Blood pressurecirculationmusclespainkillerbrainheartbeatorganrelaxation1. When we laugh, we use 15 different ________ in our face.2. Laughter is good for every ________ in our body.3. When we laugh, ____________ our goes down.4. Laughter makes our ____________ better.5. A beta-endorphin is a natural __________.6. Laughter makes our _________________ lower.7. Laughter makes a natural painkiller in our ________.8. Forty-five minutes of __________ is the same as one minute of laughter.
神州十三号航天员是（ ）。
平面图形中,使静矩为零的轴必为对称轴。( )
中性轴是梁的( )。
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