30.“Mother trees” are extremely important because they ________.
A.look the largest in size in the forest
B.pass on nutrition to young trees
C.seem more likely to be cut down by humans
D.know more about the complex “tree societies”
31.The underlined word “it” in the last paragraph refers to ________.
A.how “tree societies” work
B.how trees grow old
C.how forestry industry develops
D.how young trees survive
32.What would be the best title for the passage?
A.Old trees communicate like humans
B.Young trees are in need of protection
C.Trees are more awesome than you think
D.Trees contribute to our society
2017·山东卷]
D
How fit are your teeth? Are you lazy about brushing them? Never fear: an inventor is on the case. An electric toothbrush senses how long and how well you brush, and it lets you track your performance on your phone.
The Kolibree toothbrush was exhibited at the International Consumer Electronics Show in Las Vegas this week. It senses how it is moved and can send the information to an Android phone or iPhone via a Bluetooth wireless connection.
The toothbrush will be able to teach you to brush right (don't forget the insides of the teeth!) and make sure you're brushing long enough. “It's kind of like having a dentist actually watch your brushing on a daytoday basis,” says Thomas Serval, the French inventor.
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