28. Vitamin D helps our bodies make a special chemical, and this special chemical, _______, affects our brains, making us feel happy.
| A．in turn | B．in particular | C．in return | D．in short |
相关试题
--- Jack, did you happen to see ____ black and ____ white cat?
--- Is she missing? I told you to take care of her.
| A．the; the | B．the; / | C．a; / | D．a; the |
--- Who__________ it be that is knocking at the door?
--- It ____________ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
It is the test system, _________ the teachers, that is to blame for the heavy burden of middle school students nowadays in China. 
| A．other than | B．or rather | C．rather than | D．more than |
The last letter ____ arrived yesterday morning left him______ very sad.
| A．which; feel | B．which; to feel | C．that; feeling | D．/; felt |
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