[填句补文]He has also included symbols to show which ions are nutrients， and which are common in soil or water. ________.
A、There have been many attempts to redesign the periodic table since Dmitri Mendeleev drew it up in 1871.
B、And the size of element‘s symbol reflects how much of it is found in the Earth’s crust.
C、Railsback has still ordered the elements according to the number of protons they have.
D、Raisback has listed some elements more than once.
[填句补文]We all have our own comfort foods. Interestingly， they may vary according to moods and gender. One study found that happy people seem to want to eat things like pizza， while sad people prefer ice cream and cookies. __________ Researchers also found that guys seem to prefer hot， homemade comfort meals， like steaks and casseroles. Girls go for chocolate and ice cream.
A、Bored people crave salty， crunchy things， like chips.
B、Emotional eating patterns can be learned.
C、Don‘t let emotional eating disturb your weight.
D、But emotional eating can be linked to positive feelings too.